Malicious PDF — malware analysis report

Static analysis result for SHA-256 d866ddf6a57b2190…

MALICIOUS

PDF

45.6 KB Created: 2021-06-10 21:47:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: af654b5d4374ee760b39d6bd7d471b72 SHA-1: f0a15391520311e7f8d22e24fcd764b5140f2e3c SHA-256: d866ddf6a57b21902c56b8d58766fb48c23ef80b729868d59fb94e4d71849c5f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.tw/app/431946152/want-free-robux-ad-game-hack PDF link annotation
    • http://library.ulb.ac.id/repository/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-hack-no-confusion_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-mod-version-free-download-ios_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/robux-scam_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/appsmob-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master--hack_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-roblox-clothes-templates_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-pokecoins-in-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-kitty-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/7-year-old-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000503b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x503B 26860 bytes
SHA-256: 8695376ee3ea0c35b57a700c047c05a1f29928fe96e9117279d51b2f92702f3f
font_01_sfnt_off00008e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E22 18716 bytes
SHA-256: dfea1f2fbb42c0a4123b794196a538441fcd3da49955c861ea407633706e6c08

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